Supinator origin and insertion

Supinator runs from the humerus and ulna to the radius.

What are the origin and insertion of supinator?

Supinator arises from the lateral epicondyle of the humerus, the radial collateral and annular ligaments, and the supinator crest of the ulna. It inserts on the side of the upper third of the radius. Its main action is supination of the forearm. It is supplied by the deep branch of the radial nerve (C5, C6). The attachments, actions and nerve follow Gray (1918).

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Every attachment and its bone

Origins 3

Origins of supinator, with the bone each is on
Attachment	Bone
Lateral epicondyle of the humerus	Humerus
Radial collateral and annular ligaments	None The radial collateral and annular ligaments are not segmented in BodyParts3D.
Supinator crest of the ulna	Ulna

Insertion 1

Insertion of supinator, with the bone each is on
Attachment	Bone
Side of the upper third of the radius	Radius

Actions

The actions of supinator, and which are its main ones
Action	What moves	Main or assisting
Supination	With the elbow bent, the palm turns from facing down to facing up	Main action

Each action is stated in the anatomical position: standing, arms by the sides, palms forward.

Innervation

The deep branch of the radial nerve (C5, C6).

Sources

Gray (1918), Myology, the muscles and fasciae of the forearm

See it in 3D

Visualiser · Biology Muscle Origin, Insertion and Action Explorer Paint a muscle’s origin and insertion on real 3D bones, or click a bone to see what attaches to it. Visualiser · Biology Upper Limb Muscles Explorer 114 upper limb muscle meshes, by compartment.